Structural, lithological, and geodynamic controls on geothermal activity in the Menderes geothermal Province (Western Anatolia, Turkey)

Roche, Vincent; Bouchot, Vincent; Beccaletto, Laurent; Jolivet, Laurent; Guillou-Frottier, Laurent; Tuduri, Johann; Bozkurt, Erdi̇n; Oguz, Kerem; Tokay, Bülent

doi:10.1007/s00531-018-1655-1

Cited by 29 publications

(17 citation statements)

References 140 publications

(193 reference statements)

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“…The rollback in the Aegean and the steepening of the Cyprus slab started subsequently. Even thermal anomalies in western Anatolia, extending from the upper mantle into the crust, might be generated by the rollback and slab tearing (Roche et al, 2019). Biryol et al (2011) and Portner et al (2018) found evidence for a smaller tear in the Cyprian trench, defining an eastern and a western Cyprian slab and linked the tearing to volcanism in the Central Anatolian Volcanic Province.…”

Section: Tectonic Setting Of the Regionmentioning

confidence: 99%

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Influence of Upper Mantle Anisotropy on Isotropic P‐Wave Tomography Images Obtained in the Eastern Mediterranean Region

et al. 2020

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Seismic body‐wave tomography studies typically assume an isotropic upper mantle, possibly mapping anisotropy into artificial isotropic velocity anomalies in the resulting images. The Eastern Mediterranean with its oceanic, continental, and extinct subduction systems, as well as dense station coverage, provides an ideal setting to explore this issue. To examine the influence of seismic anisotropy, our study deals with both synthetic and real data inversions in which realistic seismic anisotropy models derived from 3D mantle convection simulations and shear wave splitting measurements are taken as a priori constraints. Spatial large‐scale velocity perturbations are mostly consistent between models derived with and without considering anisotropy. Small differences in the magnitude (up to 2%) and shape of velocity perturbations occur, and some structures are less diffuse when including anisotropy. Additionally, good backazimuthal coverage of teleseismic events and a larger data set improve the resolution of our model with respect to previous tomography studies and allow us to better interpret first‐order isotropic velocity anomalies. Key features, such as the half‐arc subducting oceanic plate in the southern Aegean and a wide and deep tear in the slab beneath southwestern Turkey, are clearly visible in all models. Our final tomography images also provide evidence for a shallow horizontal tear in the northern Hellenides and a vertical tear between two parts of the Cyprian slab. In eastern Anatolia, slab‐related high‐velocity anomalies are absent due to the continental collision and break‐off.

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Section: Tectonic Setting Of the Regionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Upper Mantle Anisotropy on Isotropic P‐Wave Tomography Images Obtained in the Eastern Mediterranean Region

et al. 2020

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“…In the shallow crust (above the brittle-ductile transition), permeability is expected to decrease with increasing lithostatic pressure (e.g., Manning and Ingebritsen, 1999;Saar and Manga, 2004;Achtziger-Zupančič et al, 2017), but this depth dependence may be less effective in highly permeable fault zones, like extensional faults in the Larderello and other geothermal systems (Della Vedova et al, 2008;Scibek, 2020). In the case of a constant-pressure boundary condition at the top surface (a more realistic condition for geological systems than a "no-flow" condition), the fact that permeability decreases with depth has important consequences for convective patterns.…”

Section: Depth-dependent Permeabilitymentioning

confidence: 99%

On the morphology and amplitude of 2D and 3D thermal anomalies induced by buoyancy-driven flow within and around fault zones

et al. 2020

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Abstract. In the first kilometers of the subsurface, temperature anomalies due to heat conduction processes rarely exceed 20–30 ∘C. When fault zones are sufficiently permeable, fluid flow may lead to much larger thermal anomalies, as evidenced by the emergence of thermal springs or by fault-related geothermal reservoirs. Hydrothermal convection triggered by buoyancy effects creates thermal anomalies whose morphology and amplitude are not well known, especially when depth- and time-dependent permeability is considered. Exploitation of shallow thermal anomalies for heat and power production partly depends on the volume and temperature of the hydrothermal reservoir. This study presents a non-exhaustive numerical investigation of fluid flow models within and around simplified fault zones, wherein realistic fluid and rock properties are accounted for, as are appropriate boundary conditions. 2D simplified models point out relevant physical mechanisms for geological problems, such as “thermal inheritance” or pulsating plumes. When permeability is increased, the classic “finger-like” upwellings evolve towards a “bulb-like” geometry, resulting in a large volume of hot fluid at shallow depth. In simplified 3D models wherein the fault zone dip angle and fault zone thickness are varied, the anomalously hot reservoir exhibits a kilometer-sized “hot air balloon” morphology or, when permeability is depth-dependent, a “funnel-shaped” geometry. For thick faults, the number of thermal anomalies increases but not the amplitude. The largest amplitude (up to 80–90 ∘C) is obtained for vertical fault zones. At the top of a vertical, 100 m wide fault zone, temperature anomalies greater than 30 ∘C may extend laterally over more than 1 km from the fault boundary. These preliminary results should motivate further geothermal investigations of more elaborated models wherein topography and fault intersections would be accounted for.

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“…see Roche et al, 2018b]. Slab dynamics controls the bulk of heat source at the base of the crust and therefore explains (i) the different pattern of deformation, asymmetrical in the central and eastern Aegean Sea versus symmetrical in the western Cyclades and in the Menderes Massif, which may be related to the activity of asthenospheric flow underneath , (ii) the retrogression in greenschist-facies or amphibolite-facies conditions within the metamorphic domes in the Aegean domain, (ii) the current localization of geothermal resources in the Menderes Massif [Gessener et al, 2018;Roche et al, 2018c].…”

Section: Cyclades and Menderes Massif) (See The Compilation Ofmentioning

confidence: 99%

Slab fragmentation beneath the Aegean/Anatolia transition zone: Insights from the tectonic and metamorphic evolution of the Eastern Aegean region

et al. 2019

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Structural, lithological, and geodynamic controls on geothermal activity in the Menderes geothermal Province (Western Anatolia, Turkey)

Cited by 29 publications

References 140 publications

Influence of Upper Mantle Anisotropy on Isotropic P‐Wave Tomography Images Obtained in the Eastern Mediterranean Region

Influence of Upper Mantle Anisotropy on Isotropic P‐Wave Tomography Images Obtained in the Eastern Mediterranean Region

On the morphology and amplitude of 2D and 3D thermal anomalies induced by buoyancy-driven flow within and around fault zones

Slab fragmentation beneath the Aegean/Anatolia transition zone: Insights from the tectonic and metamorphic evolution of the Eastern Aegean region

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